Drained

What is it about the ability of an exam to suck the brains out of you?

I had a test today. I'm sure I won't get as good a grade as last time, because it was way more difficult. I thought. Or maybe it was because I didn't study for it as much. Or maybe it was that I didn't have any chocolate while I was studying... yeah, that's got to be it.

But boy, I feel drained. Don't ask me to think any more today. My brain cells are in hibernation.